This is David Pyo ,new member from Melbourne Australia.
I have Catana 474 catamaran with hydraulic steering system.
I had desynchronize problem badly. I did change two piston(ram) port and starboard, and breath air myself many times.
But the problem was still there,
So I added cable system to tie the rudders together on the top of hydraulic system.
This time it works !!!!!! Now I only synchronize once a week.
some how I still believe that hydraulic rudder steering system should work by itself.
Anyone who have same experience, or Know how to improve hydraulic steering system in catamaran
please write some advice